C++ LayoutObject::isLayoutBlockFlow方法代码示例

static LayoutObject* getParentOfFirstLineBox(LayoutBlockFlow* curr, LayoutObject* marker)
{
    LayoutObject* firstChild = curr->firstChild();
    if (!firstChild)
        return nullptr;

    bool inQuirksMode = curr->document().inQuirksMode();
    for (LayoutObject* currChild = firstChild; currChild; currChild = currChild->nextSibling()) {
        if (currChild == marker)
            continue;

        if (currChild->isInline() && (!currChild->isLayoutInline() || curr->generatesLineBoxesForInlineChild(currChild)))
            return curr;

        if (currChild->isFloating() || currChild->isOutOfFlowPositioned())
            continue;

        if (!currChild->isLayoutBlockFlow() || (currChild->isBox() && toLayoutBox(currChild)->isWritingModeRoot()))
            break;

        if (curr->isListItem() && inQuirksMode && currChild->node()
            && (isHTMLUListElement(*currChild->node()) || isHTMLOListElement(*currChild->node())))
            break;

        LayoutObject* lineBox = getParentOfFirstLineBox(toLayoutBlockFlow(currChild), marker);
        if (lineBox)
            return lineBox;
    }

    return nullptr;
}

TEST_F(LayoutObjectTest, DisplayInlineBlockCreateObject) {
  setBodyInnerHTML("<foo style='display:inline-block'></foo>");
  LayoutObject* layoutObject = document().body()->firstChild()->layoutObject();
  EXPECT_NE(nullptr, layoutObject);
  EXPECT_TRUE(layoutObject->isLayoutBlockFlow());
  EXPECT_TRUE(layoutObject->isInline());
}

LayoutObject* FirstLetterPseudoElement::firstLetterTextLayoutObject(const Element& element)
{
    LayoutObject* parentLayoutObject = 0;

    // If we are looking at a first letter element then we need to find the
    // first letter text layoutObject from the parent node, and not ourselves.
    if (element.isFirstLetterPseudoElement())
        parentLayoutObject = element.parentOrShadowHostElement()->layoutObject();
    else
        parentLayoutObject = element.layoutObject();

    if (!parentLayoutObject
        || !parentLayoutObject->style()->hasPseudoStyle(FIRST_LETTER)
        || !canHaveGeneratedChildren(*parentLayoutObject)
        || !(parentLayoutObject->isLayoutBlockFlow() || parentLayoutObject->isLayoutButton()))
        return nullptr;

    // Drill down into our children and look for our first text child.
    LayoutObject* firstLetterTextLayoutObject = parentLayoutObject->slowFirstChild();
    while (firstLetterTextLayoutObject) {
        // This can be called when the first letter layoutObject is already in the tree. We do not
        // want to consider that layoutObject for our text layoutObject so we go to the sibling (which is
        // the LayoutTextFragment for the remaining text).
        if (firstLetterTextLayoutObject->style() && firstLetterTextLayoutObject->style()->styleType() == FIRST_LETTER) {
            firstLetterTextLayoutObject = firstLetterTextLayoutObject->nextSibling();
        } else if (firstLetterTextLayoutObject->isText()) {
            // FIXME: If there is leading punctuation in a different LayoutText than
            // the first letter, we'll not apply the correct style to it.
            RefPtr<StringImpl> str = toLayoutText(firstLetterTextLayoutObject)->isTextFragment() ?
                toLayoutTextFragment(firstLetterTextLayoutObject)->completeText() :
                toLayoutText(firstLetterTextLayoutObject)->originalText();
            if (firstLetterLength(str.get()) || isInvalidFirstLetterLayoutObject(firstLetterTextLayoutObject))
                break;
            firstLetterTextLayoutObject = firstLetterTextLayoutObject->nextSibling();
        } else if (firstLetterTextLayoutObject->isListMarker()) {
            firstLetterTextLayoutObject = firstLetterTextLayoutObject->nextSibling();
        } else if (firstLetterTextLayoutObject->isFloatingOrOutOfFlowPositioned()) {
            if (firstLetterTextLayoutObject->style()->styleType() == FIRST_LETTER) {
                firstLetterTextLayoutObject = firstLetterTextLayoutObject->slowFirstChild();
                break;
            }
            firstLetterTextLayoutObject = firstLetterTextLayoutObject->nextSibling();
        } else if (firstLetterTextLayoutObject->isReplaced() || firstLetterTextLayoutObject->isLayoutButton()
            || firstLetterTextLayoutObject->isMenuList()) {
            return nullptr;
        } else if (firstLetterTextLayoutObject->isFlexibleBoxIncludingDeprecated() || firstLetterTextLayoutObject->isLayoutGrid()) {
            firstLetterTextLayoutObject = firstLetterTextLayoutObject->nextSibling();
        } else if (!firstLetterTextLayoutObject->isInline()
            && firstLetterTextLayoutObject->style()->hasPseudoStyle(FIRST_LETTER)
            && canHaveGeneratedChildren(*firstLetterTextLayoutObject)) {
            // There is a layoutObject further down the tree which has FIRST_LETTER set. When that node
            // is attached we will handle setting up the first letter then.
            return nullptr;
        } else {
            firstLetterTextLayoutObject = firstLetterTextLayoutObject->slowFirstChild();
        }
    }

    // No first letter text to display, we're done.
    // FIXME: This black-list of disallowed LayoutText subclasses is fragile. crbug.com/422336.
    // Should counter be on this list? What about LayoutTextFragment?
    if (!firstLetterTextLayoutObject || !firstLetterTextLayoutObject->isText() || isInvalidFirstLetterLayoutObject(firstLetterTextLayoutObject))
        return nullptr;

    return firstLetterTextLayoutObject;
}

static inline bool isMultiColumnContainer(const LayoutObject& object)
{
    if (!object.isLayoutBlockFlow())
        return false;
    return toLayoutBlockFlow(object).multiColumnFlowThread();
}